Apparatus for treating flowable solids



Get 26, 19. J. L. ERISMAN 2,452,352

nrrmw us FOR TREATING mom 811E soups Filed Dec. 19, 1944 5 Sheets-Sheet1 J. L.. ERISMAN 2,452,362

Filed D90: 19-, 1944 J. a. ERISMAN urmrus FOR TREATING momma somns Filed1m 19, 1944 5 s eets-sheet s J. L. ERISMAN APPARATUS FOR TREATING SOLIDSs Sheets-sheet 4 Filed D90. 19, 1944 i/wil Oct. 26, 1948.

Filed Dec. 19, 1944 J. L; ERISMAN 2,452,362

APPARATUS FOR TREATING FLOWABLE SOLIDS.

5 Shee ts-Sheet 5 Patented Oct. 26,1948

AYPARATUS FOR TRE SOLID QFFICE ASTING FLOWABLE John LErisn'nan, OakPark,'lli., assignor to Link 1 Belt Company, a corporation oi IllinoisApplication December 19, 1944, Serial No. 568,859

, ii a This invention relates to new and useful improveinents inapparatus for treating flowablc solids, and deals more specifically withapparatus which will screen and cool such solids and effect separationand removal oi-dust, or'other fines.

Although this apparatus ls suitable for treating' many diiie'rentmaterials and for use as 'a primary cooler, if the temperature'reductiondesired'isnot too-great, it specificallywllibe describedin connectionwith its use as a'screening and auxiliary cooling unit for foundry sandbeing reconditioned "or reclaimed.

The patent to Hartley and Whitehead, No. 2,326,218, issued August .10,1943,"discloses'and claims a method of and apparatus for'reclaimingfoundry sand, and particularly core sand, so that it will be suitablefor re-use. This patented method and apparatus includes thesteps ofheating the used core sand to'withln' a temperature range of from500to1500 Fitc drive oil the burnt 'and spent binder ma'terials-andother foreign matter adhering 'to the sand grains; then passing thehotsandthrough arotary, in-

ternal louvre cooler of the type broadly covered by the patent to Bojnerand Pehrson,-'- No. l,'?09, i56, issued April" 16, 1929;= and finallyscreening the sand vto remove all oversizematerial and delivering thereclaimed sand grains of proper size to a belt conveyor'which'xcarries'it to storage or tozvthezproper location "in the foundryfor immediate re-use. ii g The xrotary; louvre 1 cooler :employed: sin'ithe above noted patentedimethodw'of courseycan be p, providedof a'proper size to efiectianyxztemperatur {reduction that is necessary tocondition the '3 so. d fors'iafeahandlingxby a belt conveyo'nrorilorstoregejor immediate rez-usex slit has-been; deter-- mined; fhowevencthat a= considerablew-ssaving in the. total costofztthisitypeJofzxsand reclaimingiinr stallation' canxbe" effectedloycemploying a rotary,

louvreacooler of a size'Which is :capabl'e ofFreducing'. "the:temperature oizithe- :sa'nd: only to-:a: value whichclwill tpermitwitito; i bezzhandled safelyf by; 5a

vibrating screen and zby efiecting: ,theilfinalxrtems peraturevreductionawhile 'screening, out thetoversize, material 1 and: i effectingathecr'removalzi of i.the dust resulting from the screening operation."It? is ":the: :primary; :object of suns invention to .provide-;-:anin'expen'sivei? compacts-unit lLWhldh: sis

.capablesofsscreenixigizand :-:coo1ing:"flowableisolids .andvrremoving-xthe; dust: hat: ,screenin'g-mperationi: t I

15 10 provide apparatusisof ti-tlie above-mentioned typeiiivhichrr'employsi aa singlertorc'ed zflowf-iofi'aic "tit 'tion will beapparent during throughoutthe same,

4 i'liaims. (Ci. 22-89) for cooling the materialboth while it" is beingscreened and after it has passed through the screen; for assisting in"maintaining the material in a loose or unpacked condition whileinengagement with the screening-surface to facilitate separation of dust,and forearrylngofi the separ t dust. t f f I t. 1 Insandreclamationinstallations offthe'above noted type fithe temperaturereducing capacity of a given size' of irotary, louvre cooler can-beincreased by spraying water onto the sand passing 'therethrough. Thesand'discharged frorna rotary cooler oi this type'carries withit somemoisture when it is discharged. i a I A "further primary-'objectof theinvention is to utilize the forced flow of cooling and dustiremoving-air to drive ofithis moisture from the sand 'whileit-is'-'beingscreened and cooled. nther obiects and 'advantages ofthevinven thec'oursefiof the following'description. r

In the accompanying 1:drawings nforming a part of this speclfication'-and in? which like numerals areLe'mpIOye'd to designate like partsrFigure-i-i is az'side elevationallvievv oi? C l'IGL' fiOW ablewsolidstreatingl appa tusi'embodying this invention; 1 J-AFigura 21saafront-elevational view oi the .apparatusdiscloseduin Figil; c a an:rig- 1 :Figure Janis ;an: enlarged iverticali sectional view takenon'linetof-Figimr Figure 4 is a vertical sectional view takemon 1ine.'Of'mg.'73 2. (1, 5-; 1.: SI .i: t Figure :5 is .a :top' plan iewppartlbrokenaway, of the;apparatusz'discloseciain:Figs;v 3 and-54', -11: 1:.Figure 6111s a, detail; :.:horizontal sectional view Figureufiwis": anelevati'ona view of th-ecfra'g; mentary portio :0 thpparatus'disclosedin Fig.=:6,-and.r -w-Figure:'=.8 1' is a stall.vertical section takeniornline; ofsliigiz 'qxIn: theztdra'wings,hereinsfor he purpose": illustration :is.showmithe.epreferrdienibodiment otthis: invention, :andfirstieparticularly referring torEigswlii and 2;eth referencenumeralulii designatesithe discharge end i'oita; rotaryplouvrekicoolerof thezitypexdisclosd iin-i' theiiaforesa'id patent "to Bo'jneri'andzPehrsoniia Il'usaunit constitutes-t the primary cooler of thefiowable solids treating apparatusiawhenithis apparatus is employedizasapart oiiian installatiori sfor reconditioning :oit; retclaiming oundryts'and'. 'Tlieiifsolid'sdischarged from itheiirotary icooler iii] arereceived hythe The discharge chute i2 is suitably connected I Figs. 1, 2and 3 as being connected to the outlet to an extension ll that isillustrated in Figs. 3

and 5 as being connected to and extending into a stationary cover, orexhaust hood, l5. This exhaust cover or hood is properly shaped toprovide an exhaust opening II for connection with an exhaust duct I!that is shown in Figs. 1 and 2 as extending to and communicating withthe exhaust duct i3 of the primary cooler discharge hood ll.

Positioned beneath the exhaust cover or hood i5, and telescopicallyassociated with the base flanges lid of the cover or hood I5, is avibrating screen that is designated in its entirety by the referencecharacter it. This vibrating screen may be of any desired conventionaltype but for the purpose of this disclosure it is illustrated asconsisting of a screen box I! that is supported for vibratory movementsby the leaf springs 20. A screen cloth, of appropriate mesh, 2! isproperly positioned within the screen box it. A belt driven vibratorunit 22 is suitably attached to the screen box i9. Fig. 1 discloses amotor 23 for driving this vibrator unit.

Suitably attached to the screen box It, and forming therewith acomposite vibrating structure, is a pan 2. This pan is of box-likeconstruction for it includes suitable side and end walls.

Figs. 3 and 4 disclose the pan 24 as being provided with an inclinedbottom wall structure 25. This bottom wall structure is intended toallow for the passage of air therethrough and to cause the solids tocascade thereover so as to be subjected to the air that passes throughthis wall structure. One construction that will accomplish these twofunctions is illustrated as consisting of a series of spaced, partiallyoverlapping or stepped louvre plates 2!. It will be noted that thisbottom wall structure bridges all of the interior of the pan with theexception of a portion that is left at the bottom of the inclined wallstructure to provide a discharge opening 21'. It will be noted that thisdischarge opening underlies the discharge end portion of the screencloth 2i.

Figs. 3 and 4 disclose in detail a stationary hopper 28 that ispositioned beneath the pan 24. This hopper is formed with the side walls29 and 30, see Fig. 4, the front wall 3i, the rear wall 32, and theinclined bottom wall 33, see Fig. 3. The open top of this hopper 28corresponds in dimensions with the bottom of the pad 24 and a canvas, orother flexible material, seal 34 closes the space between the hopper andthe pan to prevent the leakage of air and dust while allowing the pan tovibrate relative to the stationary hopper. This hopper is provided witha discharge opening 25 that communicates with a discharge chute 36. Itwill be noted by inspecting Fig. 3 that the discharge opening 35 of thehopper is vertically aligned with the discharge opening 21 formed in thebottom wall structure 25 of the pan II.

An opening 31 is formed in the front wall 3| of the hopper. Thedischarge end of the cold airduct 18 is suitably attached to the marginsof this opening 31. This duct is illustrated in of the blower 89 that isdriven by the motor "a.

This cold air duct 38 is illustrated in Figs. 3 and 6 to 8 inclusive asincluding an elbow portion 380. To cause the flow of air to be uniformthroughout the cross section of this elbow, a series of parallelpartition walls 38b are arranged within the bore of the elbow. Thesepartition walls are shown in Fig. 6 as terminating at the discharge andof the elbow 38a, or at the entrance to the air inlet opening 31 of thehopper 28.

Figs. 3, 4 and 6 disclose a series of vanes 40 as being attached to thefront wall 31 of the hopper in alignment with the air inlet opening 31formed in this wall and with the discharge and of the cold air ductelbow 38a. It will be noted by inspecting Fig. 3 that the outer edges ofthese vanes 20 are stepped and that these vanes lie in the path thatextends between the discharge opening 21 of the pan bottom wallstructure 25 and the discharge opening 35 at the bottom of the hopper28. g

The discharge chute 36 of the hopper 28 is intended to deliver thecompletely cooled solids to a conveyor which will carry the solids, suchas reclaimed core sand, to a storage bin or to a proper place forimmediate use.

Figs. 1 to 4 inclusive disclose the discharge chute 36 as delivering thesolids to the upper, or active, run ll of a belt conveyor. This beltconveyor is illustrated in Figs. 2 and 4 as being trained over an endroll 2. Suitable idler roll assemblies, not shown, will be provided forproperly supporting the runs of the belt conveyor during the remainderof their paths of travel. Figs. 3 and 4 disclose in detail a supportingplate 43 which underlies the top run ll of the belt conveyor where itreceives the solids from the discharge chute 36 of the hopper 28.

It is deemed advisable to enclose the reclaimed sand, or other cooledsolids, while they are being conveyed away by the upper run M of thebelt conveyor. For this reason, a housing overlies the active run of theconveyor. This housing includes the cover'plate N and the side skirts15. A canvas, or other flexible material, sealing strip 46 depends fromthe bottom edge of each of the side skirts l5 and the hopper dischargechute 36. Seal ofi' curtains ll depend from the cover plate 44 of thecasing that overlies the active run ll of the conveyor belt. Thesecurtains may be made of canvas. or other flexible material, and functionto prevent loss of cold air down the path of the conveyor.

Figs. 1, 3 and 5 illustrate a refuse chute 48 as being connected to theexhaust cover or hood l5 in a proper position to receive the oversizedmaterial discharged as tailing from the vibrating screen. A back suctionclosure gate 49 is provided for the chute 48. This gate is kept closedby the air suction created in the chute 48 as a result of the flow ofair upwardly through the vibrating screen and the exhaust cover or hoodi5. Of course, this gate opens to allow for the discharge of theoversize material when it flows through the chute 48.

By inspecting Fig. 3, it will be seen that the solids are delivered bythe feed chute extension ll onto the receiving end of the screen cloth2i. These solids will move down the screen cloth while sand grains, orother solids of proper particle size, pass through the screen cloth andthe oversize material moves on into the refuse chute 48. The solids thatpass through the screen cloth fallonto -"the*louvr'e plates ofthebot'toin wall structure ofthe pan i k-"The solids are causedto-cascade .over'th'e louvre plates-until they reach the dischargeopening 21- when' they will be delivered to theihopper 2!. In fallingthrough the hopper. the solids will encounter the vanes 40 and willcascade over the-outer edges of thesewanes until they reach thedischargeopening 35 of the hopper. After passing through this discharge opening,the solids will be delivered onto the upper; run of the belt conveyor bythe hopper discharge chute 38.

' The forced supply of cold air is discharged into the interior of thehopper Ruby the duct 38; J In Jeavingthe discharge end of the ductelbow88a,

the cooling air will pass betweenthe vanes lfland will be directedintothe stream of solids cascoding over these vanes. The,coolingair,-therefore, will be placed in intimate contactwith thethrough this cascading layer of solids, the air flows upwardlycountercurrent to the falling solids from the screen cloth it. The air,also, will flow through the layer of solids moving over the screencloth, Therefore, further intimate contact between the cooling air andthesolids is provided in the pan is and at the surface of thescreencloth. After passing through the solids on the screen cloth, the airmoves upwardly into the cover or hood l5 and then into the exhaust ductll.

It will be appreciated that dust, or fines, will be separated from thesolids during the screening operation. The passage of the cooling airthrough the solids moving over the screen cloth will tend to maintainthe solids in a loose, unpacked condition and will consequently assistin the operation of separating dust. This dust will be carried into thecover or hood l5, and the exhaust duct W, by the upward ilow of air fromthe screen cloth.

In some installations water is sprayed onto the solids passing throughthe rotary cooler it to assist in lowering the temperature of saidsolids. Such an operation may result in the discharge of moist solidsfrom the hood ii. The flow of cooling air through the solids passingover the screen cloth will drive off this moisture.

It is to be understood that the form of this invention herewith shownand described is to be taken as a preferred example of the same, andthat various changes in the shape, size, and arrangement of parts may beresorted to without departing from the spirit of the invention or thescope of the subjoined claims.

Having thus described the invention, I claim:

1. Apparatus for cooling, screening and removing fines from iiowablesolids, comprising the combination with a rotary primary cooler having astationary hood provided with chute for discharging the partially cooledsolids and a duct for exhausting the spent cooling air, of a vibratingscreen receiving the solids from the discharge chute, a pan attached tothe bottom of the screen to vibrate therewith, an inclined series oflouvres bridging a portion of the interior of the pan and over whichscreened solids casthe interior of the pan and over which screenedWhittle! i bet s-rich,ins-1 m oi "the series, a stationary hopperpositioned below the receive the solids discharged from the lower endof-the series oi'louvres, said hopper having a dischargejopeningunderlying the unbridsed portion of the'pan, a blower having a dischargeduct located at .oneside of andopening through the side V hopper sothatit will pass first through the stream or'solidsdischarb ing from theseries of'louvres, then through the 'solidsfcascading over the 'louvres,"and finally through the solids moving over the'screen tc'effeet finalcooling of saidsolids, a stationary cover 'overthe vibrating screen. toreceive the air and suspended tines rising from the solids on thescreen," and gap; exhaust duct connecting the cover to the exhaust ductof the primary cooler.

2. Apparatus, for cooling, screening and removing fines from flowablesolids, comprising the combination with a rotary primary cooler having astationary hood provided with a. chute for discharging the partiallycooled solids and a duct for exhausting the spent cooling air, of avibrating screen receiving the solids from the discharge chute. astationary hopper having a bottom dis-v charge opening positioned belowthe vibrating screen, a pan interposed between the vibrating screen andthe hopper and attached to the bottom of said screen to vibrate with thelatter, an inclined series of louvres bridging a portion of solidscascade before being discharged from the lower end of the series, meansfor sealing between the vibrating pan per to prevent leakage of air, ablower having a discharge duct opening through the side of the hopperfor introducing a forced draft of cooling air into the hopper, a seriesof vanes, having stepped outer edges, positioned in the hopper inalignment with the duct opening and projecting into the vertical pathlying between the discharge opening of the hopper and the lowerdischarge end of the series of louvres, the cooling air being introduced50 that it will pass first through the stream of solids discharging fromthe lower end of the series of louvres, then through the solidscascading over the. louvres, and finally through the solids moving overthe screen to effect final cooling of said solids, and means overlyingthe vibrating screen to exhaust the air and suspended fines therefrom,

3. Apparatus for cooling and screening hot foundry sand, comprising avibrating screen box having a screening surface receiving the hot sand,a pan attached to the bottom of the screen box and underlying the entirescreening surface, an inclined series of overlapping, spaced louvresarranged to bridge all of the bottom of the pan with the exception ofthat portion which unerlies the discharge end portion of the screeningsurface, whereby sand passed through the screening surface will fallonto the louvres and cascade thereover before being discharged from thelower end of. the series, a stationary hopper beneath the pan and havinga discharge opening underlying the unbridged portion of th pan botofthehopperfadjaceiithits. -dischar g e openingj for delivering i a forced j"draft of cooling air" into the and the stationary hop-' amazes 1 fromthe discharge end of the series of louvres, then between the louvres andthrough the sand cascading thereover, and finally through the sandmoving over the screening surface, and means overlying the screen box toexhaust the air and suspended fines from said box.

4. Apparatus for cooling and screening hot foundry sand, comprising avibrating screen receiving the hot sand, a pan attached to the screen tovibrate therewith, an inclined, stepped wall structure positioned in thepan and having a discharge opening at its lower end, said wall structurehaving openings for the passage of cooling air, a stationary hopperunderlying the pan and having a discharge opening vertically alignedwith the discharge opening of the pan wall structure, a forced air ductopening through the side wall of the hopper that is adjacent the saidvertically aligned discharge openings so as to discharge the flow ofcooling air at right angles to the path lying between said openings, aseries of vanes having stepped outer edges, positioned in the hopper inalignment with the air duct opening and projecting into the said pathlying between the discharge openings, the cooling air entering thehopper being directed to how through the air openings in the pan wallstructure and through the vibrating screen, and means overlying thevibrating screen to exhaust the air.

JOHN L. ERISMAN.

' REFERENCES CITED The following references are of record in the fiie ofthis patent:

UNITED STATES PATENTS Number Name Date 317,094 Constant May 5, 1885375,782 Stone Jan. 3, 1888 987,460 Heldman Mar. 21, 1911 2,326,218Hartley et al Aug. 10, 1943 2,320,755 Smith June 1, 1943 FOREIGN PATENTSNumber Country '1 Date 298,396 Great Britain Oct. 11, 1928

